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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16a887c304c4dde23a7280db8cc312e610429e5d81b8c1354d034dc929ab5784' 
  AND token = 'NUTa6Hxb3AMiGAI6ITIk5BSNWQZK9uEzZrrTyTCK/Ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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