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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d6feca6a6dc706d0d082e72782a02af269aa8b6db1c46f62f2e1539f43cadd7' 
  AND token = 'vb1OgRrfKj1lfvX9KH0tfUtpFkb0HBHvhP7dvHB0CKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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