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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc4247cc28e7d9a6074df4e0b8b80e1434314513e7aeca6cf3019e5610f274cb' 
  AND token = 'tbLgOfVcOJ2rpCEK+A0s+PbOcpJFuaBFQvEvgrQKN9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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