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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '938ff068db1e90dd5377e0ed3ff780ef2d732ba9c3909dc7c42256cc9b38579a' 
  AND token = 'NREVxVs5l+zxX3HYGoefwcOR0oMlW4hwyQrVExgmM1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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