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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63705991c96784a5bd14480c0c7fe796655ece3d5e3ca9092aab0f9dd7abbb8c' 
  AND token = 'YhBii5J/vPYGHPcSBpFK2uxkhiFjEPE5ON3GEjJ6/QQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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