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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52be9fc1f4814914f4f5955b4e7d16998971ea1b0d5128432de9e10093b0b9bb' 
  AND token = '8/NSeQNZWzwTArskjMyyDAfPzdjxpoH8KIRaPSYXHlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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