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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d54137d9fad12e2d136fac3f5be25422c71e034f58ea8eefc43bf2e19b7b37d' 
  AND token = 'aYywXDzlc2FSICPUDyqPETSCmu7LgTmTArvO+bdsJXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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