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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9be1d74c1440aa8eddc3e399187f82c9e94f09aecf16c9c2acfec391ebdb63b3' 
  AND token = 'M+l3Fosv0Qfc8V8Ex/5FkJvxT6waF6ok2/WiBbcMFSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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