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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc76c9017b2d02b414c711945e1617e61fd5a2d616747edf1bec343d98791b79' 
  AND token = 'JX2ywNYY5daEPQViHID6U44k0lsRA7KtjqXAw67dCiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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