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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e79ca10fe6ab2d53b4f7e7e2122c37bb90b5ccc8273288fe63de936333a1a31' 
  AND token = 'CNSkgdNxb9bZxqKFfY20Hs2GSyXzZcDAErFPv14OIYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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