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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '011d82e29d1af7294f7d9e16490f80aaa0fb1b6ccc30d19d0bc7f72ab06186c1' 
  AND token = 'o9zg/xl8X2b34KcPWAqbpDiot1EWvQqRn+uUetehPRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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