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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14b532911254acea63f0ddb6c7009c2047abb6c7a1823b3888e63a224041b4ce' 
  AND token = 'qsUCD1dvsQvvujeGOJIxZJs3dXpx7fJXyj4KQ4jdFFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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