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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '609420fb72d0408d717051c3dcf495d6ac39e3a25a20e46114e9610aafe9431d' 
  AND token = 'cy8DjedEniGmt78iK8XE3Q95MOa7GPmiHBWDMQU6j4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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