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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0f07a9692f40ac2bac9ff604fbeae712a7366ff93d6476b3d9b8928f748629b' 
  AND token = 'bW2iTE47JXNGsCA5Utok+5k5UiwciD9wRiwHbjoGwKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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