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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd79aed44a8bb85384be8bd951cc8ebced572a0ac9196cced83156509cd7a5acf' 
  AND token = '+MS/I683ZJxHqXJGE+rCaq3xR0uqsuGjMfBwVHfR+to=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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