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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1455cb6b242c019f1500eb295068401c0e50abec95884b992e862c579208f619' 
  AND token = 'RAXG4MCW3MUjQCjv0YCX5EV0pyZneAPE/V5/bwttdi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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