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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03676cfd99aa0631791fbe065974f55765aa2b5ab1f2dfac8e3f82c19c540e74' 
  AND token = 'atBKXWFMkj73LHNTJagp94HuXKVPiSKk+kvXa0vfeNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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