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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c08af8e843eb680eabe291877f7612455698b6ca1d80a7436f668b91888db919' 
  AND token = 'ypWus6AE2LrRxzNXssqshj0zg8GCcg0n/Tq1/J+34gA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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