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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b0e5345c5c3a2101bebae82e9a79b56a7c5c28aaf46bed36460e5f8e5728bd9' 
  AND token = '2zDip5zvKRMO0ks1IcfgIZmIo7tWOW/10lVBYXuVnbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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