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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60f8fbe07f246071624f24093e32d0f6de0555d6ebfc60c9563cd7692b45522c' 
  AND token = 'TZ55OTsKo9ikhPvwS00bPw5AZ7vC7ScIrNNuFgtWIVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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