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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f746201d7554761546c6371092328da2f1fd6ef8591727520d5e95424ea4f7e' 
  AND token = 'iN3KZDEfmF6IO1qbxvygQABvsDja+GX2YaOAbYAYbdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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