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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcf6afea58f804e91bd971e04788ab855b3bfc70c80ab4a59fdcb740ac5a86f8' 
  AND token = 'KHVCHE6s1Jhupvl4IP7BSHO5QUF8nokJLJa4sow+mho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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