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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5de32a0b99e155db0c33238b6627bcdde69c8d96142cafa82a35c8492e1a2a33' 
  AND token = '0KgkDR9aT9wBwXjevAvuxw5vlh0wIR8ik/3cNfpynjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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