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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fad07aac915d8b5c028b73c8369f143c05e7567a26db052b45c50038fb7bdf27' 
  AND token = 'Bbxvf6eOyOS0Q/mPsYwz6dl8NHNwq37MJlc+thlC3OY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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