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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '115c7c8f82d8ba8f2697c01b8a6dbe4989cee9141de58eb09af61f83bb3a8212' 
  AND token = 'AJLB1/ubGZU8gfa1Q1kmnVCjEC19/oupN6HVqcnjTeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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