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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6e26803356ed3ad2ee03a5708f0bd0e1b2ed371ce7dc74a81b8400ea780003f' 
  AND token = 'tuaB04A1gT7zC55+Z8JDQS24He9ejLO7MpOFQqAJSSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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