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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4a2511c443a980f8a90d71714a992e065b365b9a01474306b6897c3c2ba4dba' 
  AND token = 'xfkXBpUzhf2N+whdrh+53as+VJEL8XcElHTf7U3IVKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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