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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24490130e9dbd4ef2eb7dc17cefc77627ba6fdef2c8a7efbd3bf06d0a44156fb' 
  AND token = 'q9ChTon38ZQNo/sEjUTQnZN4X8yKSjtR74jORH+Bw2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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