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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8310a11efbe8a56a2fbd7a6784029b50575c610f32cd583a3b77f0140d0cf6c0' 
  AND token = 'coGOP2Q4ZmskcmCreh5oX7S5YYLJqbTqNTXU3YsWDhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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