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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10f33b4a7f1e5e06ffabe4a7b8928aeac1ee68c3a0fbaca69697a0d81434a2e8' 
  AND token = 'vlHBS7dK1toHH30DnI2GH2DTxXimGu2sf/vtU6pP3Ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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