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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7886cb87170ff5f59394f759efdc3cc4562f30d81583bd6612467e7b72213c7e' 
  AND token = '1AuBIzpIIBv1mDnpUojbc2MOyyZcWVd9Wjw+nkzda6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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