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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9ffaba1499ef50c91bf24452856c55331837907d047d65e912a450b833f27ea' 
  AND token = 'ddqYPYrHanUBV2Se+qXE5+cETv8Ad4vBEG3lbg2mkYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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