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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e52d109400200de18630f7b3f031456179e7a760ec1ded148c8f5b25ec60077' 
  AND token = 'YH3MfNq8eqsOSPpxyHsyi3r9j4BAtdUyAmGTXo37qq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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