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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae52faaa980af58d7d12e280c8b940b037b7f3e6fdae3abc79ee367e0bca47d1' 
  AND token = 'iYZsJD479n6jlsM6Uq8tBp9TwppqwT2A5JlqOkJPxe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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