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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a53152c7645b9fcfe2cb136b2730bb04d202712906e8da3bfd81540c0c51441e' 
  AND token = 'YAMrHrwb/S0W/AaGjlXEJTBgHD7sKTLeOrX6YhgcaMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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