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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '290ec286c733a24f95bf961fee7097252d6c4fce28e0e66b582ef02daaf39164' 
  AND token = 'Qy3fOZIRlnp42pRswcLq/yhxqL/ovgeX8nVwq5DDN+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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