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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9260b24a7ab574162e97f0ed3e58f7dc1756b1bdaf05cdc9ced7b386298d1dbf' 
  AND token = 'LmADRQU+CySCx06s/xjxwM0w69FdnHwXEY6rI61j4CY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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