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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7daf8ba2df2c9264d5665d2a1d223b6f47e94a2a9483165e3866f55f07366695' 
  AND token = 'wWnH6eXPg2wy9ZkrsE/tY2meVYYnb/x3OslMkaX0Znc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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