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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b42a4b07df1b78b14f4858e18fb7537871e8233c0de217b11a7b47a704685b53' 
  AND token = 'CJhelCEKG1l6gKpaY2oiv5A5JD2pCi1xupJFCz06yus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}