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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a021452c4b3aa202eb0cf59be149476380a8bc401364301e1956181edd60d593' 
  AND token = '9NAx7kyUuqL5A/2PeaOB3VUuZkE/C/tK1MRiXjdLp9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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