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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08132c8bc2e51dc8f094cfe0fcda3ccba3971bd72141dc074e451814332915da' 
  AND token = 'WOxP6UftVrTBUWT367K+pVyvRKFwXtB31O5WbfK68BY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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