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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40da90c3a3d464ae791ae176c285975766a657c4c4eeb84ee859be6edd071c97' 
  AND token = 'gVJiUDwFIMVQQXtAu5EjtKW8t4i/424Fk8gdB6gegGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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