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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '829376ac0b0175d9671de87065796c83222305870b7e32c668f97afbe898fbcd' 
  AND token = 'Ut54uL9LD85cAp2kI5gtRSgLSYSTLPGYb+f6w1rniBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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