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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92ae8ee92815bba0ee7e015e59110367c01f40cec704e7f70b16564138b0a724' 
  AND token = 'bJfhdV7SBrMjwkyd0HXTxu9efP3v0PDXUFKiWiK5sQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00243

JSON explain

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