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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b23362e5daf66d7fe5e0dec477731eafcf7a5bc1e2a7ea548dbabd003357e7b' 
  AND token = 'Pj6qHbJpLKmtxrJtX+iXTkP4ja+9GuRr60M9JaScDPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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