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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77db0b700a522d91687497a8ffcc41e8524445240c6c4c1702d6001a1f171beb' 
  AND token = 'tRZfsbCTlf8h2daxY6+Rd9M0P/l8vzq7J+vaCEDb21A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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