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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '899089cb9b2dc069284a38f626590f8cce646d4b1e3530a0e93a5e02680d12a2' 
  AND token = 'XoDjopjasHESjPvQsxILdsxbFksrBNJkDHC8H2N/i7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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