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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01dbe401ec4416003078e7b6e81d1795bd7ce6c1718f87e33f7288ff88884560' 
  AND token = 'qNkU2Au26Lw0GME49uignw6v5QNf4ciTvJYIixrCz8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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