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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3036eef09bf173c26476ea69ebb5f78e557b5909896392de8ef5329e10c8879' 
  AND token = 'laJT1cVZ/Sl0DU/LQj2Wo4fK4LlL9eLthFko9VXcMeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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